Available for users up to 1000 lbs. with upgrades

BIG BOUNDER H-Frame power chairs are configured specifically for bariatric users. They are custom built to each user's unique dimensions. The electronics and drive train are optimized at the factory for the user. Available in seat widths from 21” to 48”. Very narrow overall widths (as little as 2.5” wider than the seat width) result in improved maneuverability through doors and tight spaces.

» 500 lb capacity is standard
» 700 lb and 1000 lb weight capacity options

BIG BOUNDER H-Frame in lavender


» Durable H-style frame uses 2.5” x 1.5” x 0.125” wall steel - TIG welded for superior strength
» 0.120” wall steel seat rails and back posts - for extra strong seat and back
» Super Torque 3 motors and brakes
» Quiet non-slip chain drive - won’t slip in rain or snow; similar to those used on many motorcycles
» Sliding dual group 27 battery box - for extended range and ease of maintenance
» Xtra Duty 12 position adjustable suspension forks - with oversized 1" diameter bearings and fork stems
» Sheet metal pan seat
» Super Duty sling back upholstery - double liner, cap, and web strap under every screw; attached with machine screws
» Detachable desk length arms
» Anti-tipping wheelie wheels
» UE1 Series electronics - 6 drive programs, battery condition meter, diagnostics, and more
» Smart electric brake release - for easy pushing by an attendant
» 9” x 3.50” aluminum caster wheels - excellent on most surfaces including grass and dirt roads
» 12.75” x 4.00” aluminum/steel drive wheels - available with smooth or knobby treads
» Safety LED taillights built in - turn on and off with chair power (turn on and off with light switch if headlight ordered)
» Very stable rear wheel drive - does not fishtail at high speeds unlike front and mid-wheel drives
» Durable black powder coated frame
» Fully automatic 8A gel cell battery charger
» Detailed Owner's Manual
» Easy to service and maintain

BIG BOUNDER H-Frame in red


  • Seat Width: 21” to 48”
  • Seat Depth: 12” to 23”
  • Seat Height: 19” to 25”
  • Back Height: 15” to 24”
  • Also custom dimensions

* Some restrictions apply


  • Recline, tilt, seat elevate, and reverse tilt
  • Dual independent power elevating legrests (DIPLR)
  • Toggle switch control or through-the-joystick proportional control


  • ONE year warranty on entire chair
  • 5 year warranty on Super Torque 3 Motor & Brake drive trains**
  • 5 year H-frame base warranty
  • 2 year H-frame seat warranty

* Limited warranties - some restrictions apply. See complete warranty for more information
** Includes motors, brakes, drive wheels, drive wheel sprockets (drive belts, tires, inner tubes, flat-free inserts, motor sprockets and bearings not included)


Power 700 Option
for users up to 700 lb

All BIG BOUNDER H-Frame features and...
» Super Torque 4M Motors (ST4M)
» All frame members either .120” wall or solid bar stock
» Reinforced footrests
» Solid Back posts
» Cross strut welded between push handle tips or back posts
» Reinforced seat mounts
» Rated for a 700 lb user

Power 1000 Option
for users up to 1000 lb

All BIG BOUNDER H-Frame features, Power 700 option features and …
» Solid bar stock arm tips
»Solid bar stock in many frame members
» Rated for a 1000 lb user
Big Bounder with reverse tilt
BIG BOUNDER with Reverse Tilt


  • Independent Drive Wheel Suspension (500 max user weight)
  • Durable powder coated frame colors
  • Several seat and back options, including Captains seat
  • Many types of front rigging and arms
  • Several styles of armrest, headrest and calf pads
  • Swing-away hand control extension slide
  • Flip up arms
  • Angle adjustable footplates
  • Center Mount Angle Adjustable Footboard
  • Footplate roller bumpers
  • Headrests: Center post, sling and power
  • Power seating: Tilt, recline, elevate, legrests
  • Several front caster and drive wheel sizes
  • Respirator shelves and O2 bottle holders
  • Many electronic options
  • Hand, chin, , sip-n-puff, switch and attendant controls
  • Many accessories: Lights, horn, rear view mirror, fan, electric leg bag emptier

*See current order/quote forms and price lists for more information

39" wide Big Bounder
39" Wide BIG BOUNDER with 5" Custom Seat Cushion
Big Bounder with tilt and flip up arms
BIG BOUNDER with Offset Front Rigging

Big Bounder with Captain's Seat
BIG BOUNDER with Captain's Seat (Van Style Seat)
and Center Mount Adjustable Angle Footboard
Big Bounder with seat elevator
BIG BOUNDER with optional 13" seat elevator and lighting package
Big Bounder H-Frame with seat elevator
46" wide BIG BOUNDER with optional 30 degree Power Tilt and Heavy Duty Dual Independent Power Elevating Legrests with oversized actuators

No pictures or graphics on this website may be used without permission of 21st Century Scientific, Inc.